Jig



Nov. 15, 1949 A. METTRICK ET AL JIG 2 Sheets-Sheet 1 Filed Nov. 28, 1945INVENTORS. HRTHUIZ NlETTE/CK, 8: BY Dav/o How. 7

HTTOENE Nov. 15,1949 A. METTRICK ETAL 2,487,823

JIG

2 Sheets-Sheet 2 Filed Nov. 28, 1945 INVENTORS Hen/m2 METrz/cK, 8

HTTOIZNEX Patented Nov. 15, 1949 JIG Arthur Mettrick, Bellmore, andDavid Hook, 1 New York, N. Y.

Application November 28, 1945, Serial No. 631,467

(Granted under the act of March 3, 1883, as

1 Claim.

amended April 30, 1928; 370 O.

This invention relatesto work holding devices andv it is embodied in ajig for supporting wire rope sockets or the like workpieces during amachining operation.

An object of the present invention is to provide means for expeditingthe drilling of ears or forks of bifurcated sockets.

Another object is to provide means for accurately drilling a plurality.of socket ears simultaneously.

A further object is to provide holding means so that a plurality ofsocket ears can be drilled by persons .having less skill than waspreviously required for drilling such articles. v

Further objects and advantages of this invention, as well'as' itsconstruction, arrangement, and operation will be apparent from thefollowing description andclaim in connection with the accompanyingdrawings, in which,

Figure 1 is a plan view of a jig embodying the invention,

Figure 2 is a cross-sectional elevation, taken along the line 2-2 ofFigure 1,

Figure 3 is a cross-sectional elevation, taken along line 33 of Figure1, and- Figure 4 is a perspective of a workpiece that is adapted to bemachined by the jig of the present invention.

A common shop practice for drilling holes I2 in the forks or ears I0,Figure 4, of the socket II is to strap the latter onto a plate, mark thecenter for each hole or opening I2 to be drilled, drill a'pilot holesmaller than the desired hole I2, and thereafter drill the full sizedhole I2, using a bit of proper size. The process is repeated for eachear Ill of a single socket II. A jig that will enable more rapid andaccurate drilling of the sockets II is obviously desirable.

As seen in Figure 1 the jig of the present invention comprises the baseplate I3 that is preferably circular as shown. A tool-guide plate I9 isattached to the base plate I3 and positioned spaced away therefrom. Thebase plate I3 is adapted to be straddled by the bifurcated end of aworkpiece II, with a fork IIl thereof disposed adjacent to each ofrespective opposite faces. This locates one fork I0 between the platesI3 and I9 in position to rest against the adjacent surface of the plateI3.

The plate I9 is provided with the tool guide hole 20 which, underpractical application of the invention, comprises a conventionaldrill-guiding bushing attached to plate 20 in any suitable manner. Asimilar hole 22 is provided in the base plate I3 disposed in coaxialaligmnent with the tool guide 20, by 20 to drill the holes I2 in bothforks ID of the workpiece II continually.

A locating stop, comprising the pins I4, is positioned for engagement bythe workpiece II thereby to position the forks ID for the holes I2 to bemachined. In the embodiment shown, two pins is project upwardly from oneface of plate 3 for engagement by the peripheral edge of one fork It,the set of pins including a similar two pins I4 project downwardly fromthe other face of plate 3 for engagement by the peripheral edge of otherfork ill. The additional locating lug I5 is provided on theunder side ofplate it presents a shoulderopposed to the adjacent face of plate l3remote from the tool-guide plate I9. The shoulder of locating lug I5serves as a rest for the fork If] remote from the drill-guide bushing 20to support the fork and prevent it from being bent under the strain ofthe drilling operation.

The device of the disclosed embodiment being constructed for holding aplurality of like workpieces II at a time for the machining operation,the tool-guide plate 9 is provided with a tool guide 2% for eachworkpiece II, and these are arranged according to preferred practice ina circle as illustrated in Figure 1. A tool guide 22 is provided in thebase plate I3 opposite each tool guide 20, and a set of locating pins I4and a lug I5 is likewise provided for each workpiece to be held by thejig. H

The plates I3 and I9 can be constructedas separate pieces attachedtogether, or, as illustrated in Figure 2, the two plates I3 and I9 canbe constructed integrally by being machined from a single piece. Legs 2!are preferably provided to rest the jig on a flat surface, the legs 2|being projected downwardly from the plate I3 and disposed between theworkpieces II at spaced apart intervals peripherally of the jig. Thelegs 2I are long enough to support the jig above the surface, forexample, of machine-tool bed plate sufficiently high for tool clearance.

The jig of the present invention comprises a longitudinal locatingdevice that extends away from the locating pins I4, and operates toguide the workpiece II in its longitudinal direction. Actuatingmechanism, is also provided operable to actuate the workpiece II towardsthe locating pins I4 under guidance of the longitudinal locating device,and to hold the workpiece located and in engagement with the locatingpins I4. In the preferred embodiment of the invention disclosed,comprising a jig for supporting a pluand this enables a drill guided I3;and

rality of workpieces I I at a time, there is a longitudinal locatingdevice and an actuating mechanism for each workpiece.

At spaced intervals about the circumference of the plate I3 are fixedstuds or arms l6 that project in a direction away from the locating pinsM. The studs I6 are adapted to be projected between the forks ID of thepiece II and through the longitudinal perforation thereof, and areattached to the peripheral edge of the base plate I 3. The studs l6 arethreaded at their ends at IT, and are engaged by the nuts l8. The baseplate I3 has a stud l6 projecting radially from its periphery in eachradius that passes through a tool guide 22, this being the same radiusthat passes between the set of stop pins [4 that 10- cates a given pieceII for the incident tool guide 20, 22. A workpiece H positioned on agiven stud i6, as shown in Fig. 2, is actuated longitudinally by the nutH3 in a radial direction inwardly of the plate l3, to contact theperipheral edges of the forks 10 with the stops M, the nut l8 operatingto hold the workpiece in abutting engagement with the stops. This holdsthe workpiece located in position for a tool, guided by the tool guides20 and 22, to machine the ears in the manner desired.

In operation, a socket II is slid over each arm IS. The lower ear ID ofeach pair of ears is positioned in the L-shaped lug [5 to rest on thesurface thereof opposed to the under surface of the plate l3, and theperipheral edges of ears l0 abut against the sets of locating stop pinsI I that respectively project from opposite faces of the plate I 3. Nutsi6 are turned on the threaded ends l! of their respective studs I6, forexample by using an end wrench, thus firmly securing each piece II inthe jig. This positions the workpieces II for machining under guidanceof the tool guides 20 and 22. The sockets II are removed by the nuts l8being retracted, after which another set of sockets H can be positionedin the jig in the manner described to locate them for their machining.

The present jig is of considerable aid in speeding up the production oflarge numbers of bifurcated members of the type shown in Figure 4. Inlarge industrial plants and in Navy yards, large quantities of shackleholes have to be drilled in sockets and the latter must be drilledquickly, accurately, and with little spoilage of materials.

The present jig provides means for rapidly securing, drilling andreleasing of the sockets 4 upon which work is to be accomplished. It isadaptable to any reasonable number of sockets, and requires a minimum oftools and skilled operators.

It is to be understood that various modifications and changes can bemade in this invention without departing from the spirit and scopethereof as set forth in the appended claim.

The invention described herein may be manufactured and used by or forthe Government of the United States of America for governmental purposeswithout the payment of any royalties thereon or therefor.

What is claimed is:

In a jig for holding an elongated workpiece that is bifurcated at itsend, the workpiece to be machined continually through the several forksof the bifurcation, a base plate adapted to accommodate the workpiecewith the several forks of the bifurcation disposed adjacent torespectively opposite faces of the plate, a tool-guide plate disposedopposite and spaced away from the base plate for a fork of thebifurcation to be positioned between them, a tool guide in the toolguideplate and a companion tool guide in the base plate in alignmenttherewith, one or more locating stops positioned to locate the workpiecefor its engagement by the tool and including an abutment surface for theworkpiece disposed opposite the face of the base plate that is remotefrom the tool-guide plate, a longitudinal locating device extending awayfrom the stops to position the workpiece in its longitudinal directionwith reference to the tool guides, and mechanism operable to actuate theworkpiece towards the stops under guidance of the longitudinal locatingdevice and to hold the workpiece in abutting engagement with the stops.

ARTHUR METTRICK. DAVID HOOK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,445,016 Golembiewski Feb. 13,1923 1,452,103 Yerxa Apr. 17, 1923 1,742,224 Swartz Jan. 7, 19302,340,508 Cooke et a1. Feb. 1, 1944 2,399,257 Tago Apr. 30, 19462,409,160 Sirp Oct. 8, 1946

